Malicious Office (OLE) / .XLA — malware analysis report

Static analysis result for SHA-256 cec7e5f59527dbad…

MALICIOUS

Office (OLE) / .XLA

383.0 KB Created: 1996-10-08 23:32:33 Authoring application: Microsoft Excel
MD5: ef4e794a49306c611a1bb3d7e0ce8064 SHA-1: 2f3dee667579ac4db4fd8f64fafeb7c3236b38ba SHA-256: cec7e5f59527dbad4fe7bc7c1662380f887af08135138739219586d04cc2ebbe
340 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File T1106 Native API

The file is an Excel add-in (XLA) containing VBA macros. Critical heuristics indicate the use of `Shell()` and `WScript.Shell`, suggesting the execution of arbitrary commands. The `Workbook_Open` macro is present, which automatically runs code upon opening the workbook. While no specific second-stage payload URL was extracted, the presence of these indicators strongly suggests the macro is designed to download and execute further malicious content. The extracted document body contains numerous function names related to data manipulation and file operations, but these appear to be legitimate Excel add-in functions and do not directly indicate the malicious intent, which is derived from the VBA execution heuristics.

Heuristics 9

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • WScript.Shell usage critical OLE_VBA_WSCRIPT
    WScript.Shell usage
  • Reference to Windows Script Host high SC_STR_WSCRIPT
    Reference to Windows Script Host
  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_Open macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • VBA p-code auto-exec with execution tokens high OLE_VBA_PCODE_AUTOEXEC_EXEC
    Compiled VBA/cache stream contains an auto-execution token together with shell/download/object-execution tokens. This catches p-code-only or source-extraction-failure macro documents where visible source is unavailable.
  • Suspicious extracted artifact high EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • VBA macros detected medium OLE_VBA_MACROS
    Document contains VBA macro code
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://cbr.ru/currency_base/daily.asp?C_month=

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
c2f0321b45e574bcdd410d99459f5b9ad027c65031df9233e84ad1bbf5c57a08		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 90809 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 shell/COM execution token(s). Carved artifact contains 11 Chr/ChrW string-construction calls. Carved macro source contains an auto-exec entry point and execution/download terms.

Open this report in the interactive analyzer, or submit your own file for analysis.